Geodesic
Differential operators of principal type
Matematika, Tome 5 (1961) no. 5, pp. 89-114.

Voir la notice de l'article provenant de la source Math-Net.Ru

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     author = {L. H\"ormander},
     title = {Differential operators of principal type},
     journal = {Matematika},
     pages = {89--114},
     publisher = {mathdoc},
     volume = {5},
     number = {5},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1961_5_5_a4/}
}
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L. Hörmander. Differential operators of principal type. Matematika, Tome 5 (1961) no. 5, pp. 89-114. http://geodesic.mathdoc.fr/item/MAT_1961_5_5_a4/